/*
 * Anything: A flexible and easy to use data structure that combines the 
 * characteristics of a list and a hashmap into one data structure.
 * 
 * Based on a paper by Peter Sommerlad and Marcel Rueedi on 
 * 'Do-it-yourself reflection' entered at EuroPLOP 1998.
 * 
 * This library was written completely from scratch and is based only 
 * in spirit on the original Java Anything implementation written by 
 * Andre Weinand/Marcel Rueedi in 1997/99 and enhanced by Stefan Tramm 
 * in 2006.
 * 
 * Copyright (c) 2008 Thomas Marti and others. All rights reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package any.functor.impl.func;

import java.util.Iterator;

import any.ImmutableAny;
import any.functor.interfaces.AsIterable;
import any.functor.interfaces.Function;
import any.functor.interfaces.FunctionTypedPredicate;
import any.functor.interfaces.OrderableIteratingFunction;
import any.impl.util.BaseIterable;
import any.incubator.IterableConfig;
import any.incubator.IterableConfigCreator;

public class AsIterableImpl<T> extends BaseAnyFunction<T, Void, AsIterableImpl<T>> implements AsIterable<T> {

	protected Function<ImmutableAny, T> asFunc;

	@SuppressWarnings("unchecked")
	public Iterable<T> apply(ImmutableAny from) {
		IterableConfig config = IterableConfigCreator.create().select(predicate).order(direction);
		final Iterable<? extends ImmutableAny> iterable = from.iterable(config);
		
		if (asFunc == null) {
			return (Iterable<T>)iterable;
		} else {
			return new BaseIterable<T>() {
				public Iterator<T> iterator() {
					final Iterator<? extends ImmutableAny> it = iterable.iterator();
					return new Iterator<T>() {
						public boolean hasNext() {
							return it.hasNext();
						}
						public T next() {
							return it.next().give(asFunc);
						}
						public void remove() {
							it.remove();
						}
					};
				}
			};			
		}	
	}
	
	@SuppressWarnings("unchecked")
	public <X> AsIterable<X> eachElement(Function<ImmutableAny, X> asFunc) {
		this.asFunc = (Function<ImmutableAny, T>)asFunc;
		return (AsIterable<X>)this;
	}

	@SuppressWarnings("unchecked")
	public <X> OrderableIteratingFunction<Iterable<X>> select(FunctionTypedPredicate<X> predicate) {
		this.asFunc = (Function<ImmutableAny, T>)predicate.getAsFunction();
		super.select(predicate);
		return (AsIterableImpl<X>)this;
	}
	
}
